relnote: Fixes test and flag description (addressing comments in

net/quic/congestion_control/tcp_cubic_sender_test.cc

Index: net/quic/congestion_control/tcp_cubic_sender_test.cc
diff --git a/net/quic/congestion_control/tcp_cubic_sender_test.cc b/net/quic/congestion_control/tcp_cubic_sender_test.cc
index a97ddb6ea37a6d470fe57f9d7d62046bf9d2a820..26041ae018a1ed52974ab6d816d25cc70e8c4d10 100644
--- a/net/quic/congestion_control/tcp_cubic_sender_test.cc
+++ b/net/quic/congestion_control/tcp_cubic_sender_test.cc
@@ -11,10 +11,12 @@
 #include "net/quic/congestion_control/rtt_stats.h"
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/proto/cached_network_parameters.pb.h"
+#include "net/quic/quic_flags.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_utils.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/quic_config_peer.h"
+#include "net/quic/test_tools/quic_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using std::min;
@@ -486,6 +488,7 @@ TEST_F(TcpCubicSenderTest, TcpCubicMaxCongestionWindow) {
 }
 
 TEST_F(TcpCubicSenderTest, TcpCubicResetEpochOnQuiescence) {
+  ValueRestore<bool> old_flag(&FLAGS_reset_cubic_epoch_when_app_limited, true);
   const int kMaxCongestionWindow = 50;
   const QuicByteCount kMaxCongestionWindowBytes =
       kMaxCongestionWindow * kDefaultTCPMSS;